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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d9ca57cbc6d253eafbd74ac6d6f74f43195d8fd44622c9f6ebc0a87ba7e7bc' 
  AND token = 'RaxVYo4r1M7mVhOt2D2yR16ojqSUaQvZ/cfBsvd9jxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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