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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd551ef1f56cba8094145ab3aa4387f4b4bfd5b7575145b70fa1fb851ae2b20f' 
  AND token = 'ANS22MdaUcp6q8Zl/kg4NkaHrF+KoukYlujMtWgxy6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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