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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b932f2345f0f05192c2601722ec4d4271c57e8ea21be15e9b4d9f870d0af0cf2' 
  AND token = '8AyySyvED2DJZqqSCaQO4zaP+TpUFGc4TCIR91Pgm6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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