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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8826ca091c478edc4e460a2866e5ea0e1a7d4085502f9abe8c6346fa0560c822' 
  AND token = 'jpKNR2G+NY4VrF5vUJLWSoRSCotPJky2ZOeph4TT1AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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