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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd208e37d234f045212656c9dfc95e2453985e6bb3602be73fbb6bca59d02fc7e' 
  AND token = 'Xm4eOY+2s628bq+FwwKn61MBdib3vBOrtOuvfodeU98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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