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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c80db8a79cf6d9ff7a4c9ba647dab54c0774df0df75d68ba550d5f4fe7a532' 
  AND token = 'odUHZ34pysgKq4AZNt3r7eUvOSSK+sbUjOul4fBoDyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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