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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb69ded0f846c9c9140fc4cfc6787a3c1469d91a08b1a5994d127b4737be74a9' 
  AND token = '785kc8r76N6kOnTHDaUz2PNZ66jz+6nWnQw7koeZbl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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