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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c7c6c5f9fc071ced3c88b6aa8f81697c7659dc752fce9e049cad58899b2c9e' 
  AND token = 'F2HsyA4vedxwmy/rA0cSWnfonloHblLwf81/dX7W0qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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