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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00170a33777172de1c9f30838bc3a4913f4b58db1cf97b1a0ef1a1ae7d1091b' 
  AND token = 'oRTDTbe6Q7De5KOo69maDoLN81SYc5k3CRo8qcLiFqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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