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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315e754f15ec481c831a759958e1703c945b3e80cc85607147dd714e69869d4d' 
  AND token = '2v58Z0cy7re6iBdZz25c67MKmA9PmF/WwKfgsLiRkBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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