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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b457a048f2629055d713f1891efd014e7aa714e1788fdfb0844d65934208656d' 
  AND token = 'bKwEcP35bbFy2Wd2p8pKEiyldQ19VIE3b1t0340d+5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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