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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13a2a96b3ad80a1b6cc30109ceb0a6100c8a4c829830f3123d69493120580bc' 
  AND token = 'R0O+Ymy5kJyVXNnU0+Cw6OdXiNpobtv05vpLsn2ifzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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