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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78176aec8bff516da8560fffd211613bc4210242d34d617e916c0b591d83de5e' 
  AND token = 't1Lcuic6Rtb/TsOEsKRC5tnwSalYI/z6bp8Is84o/94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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