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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d83773d13bf79676cca49663c221584c587cba8ace1506ee7338634d3ebc951' 
  AND token = 'RM7II2pDaBLc7zwwaqjdH9v08qMtwUfr9O+tF9ebWqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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