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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3aca7f6242f1c05f4fbee31ee685387557a345a8aff82a58cc0f5824a52ac5' 
  AND token = '/ne+oNqCL/b1fJCWkncZ/JryofcynkOoqBTABLjajFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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