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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542fa49ea437f79c179bef9bf2bcb637e361d65b18b95ce3606dc681124dd31d' 
  AND token = 'Ttpnb2c2g9gxlVaofWz1pd7vI9CTw1qBpR6js9K6sc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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