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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d076f95de6e3319c44b34df9648998225a148a4f24944ecf62c662d4cf28ba6' 
  AND token = 'yULDe4vuQD4l1w+mtvMTPNiNttoav7bLJ9hehD7/1bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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