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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36acdd0fcd139e53f166eeb45edc9febcdec158d64c32ab47007e9a0b5d73cb6' 
  AND token = 'U9L/x8fQYlfAcEREx+zLeBmk7/jvmaFEKxIeW2IfXEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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