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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568927a7d03460f5b40ae424e7c2778be42a2e79b2c00c1e1880c7a5476cc1c3' 
  AND token = 'JZfhpN/ruSlCbdldLu9BpyEFuRCD2Lh42seTLF5NYL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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