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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f189b2dfa140245a540808d4f3d6286c4729bc5bd0f6340dbb6ffcd86fd150' 
  AND token = 'zAT/3SBgm9i+5iCk3uDCdUwhbyNGlM5ScNfGW6J9lhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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