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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae0e7dd6ce4028bde33776433822d85c1eb4086a1dfa291ef96840ff8bcdd92' 
  AND token = 'uVqG4Fl33zFJ0rhIyFbmwsImfJliE31wG9A7VFiB2/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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