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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ccd7ed520e6298392aeb87c4c97830ad8b54f9926bd99d98b2bba43b213ef9' 
  AND token = 'wBX7SB6xIxP7AdtC9exypOpJy4bJ0ZJTjLRC2cmuzo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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