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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcb85f262cedd6cb24e3c3c586d849dc04cd1d9936850f6b1c0b7ffc8d2a53e' 
  AND token = 'vCj0engENfHqDv9OS2sUEWyYR+N9PJIPLkXrcZA5Ejw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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