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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cae4d6c007c0e6a33ea25563a159e172e0007f404df6cc9d808b3a9ad6d001' 
  AND token = 'jfXYiPtEzEIh10s4er8l6Byd8EYo//0yg498krobz1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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