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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0080c3660bfd509595d4a08ae2e638c1174debbacfb838c644a3d01b66c001cc' 
  AND token = 'HwQS9RQONeI4rWEi06X7UYlUh4zI+BItj896UdBp1Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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