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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6dfbb1928c9631cca3393c92c5c6800bb8252c4e65be42041bbce2f3de75d1' 
  AND token = 'MmK2H/DXlpFj5s4RcEJBu5RDkeEZo7Xh8RTqjBFSxg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}