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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948114811938f30ee91977583bf93057ce67b4d7051ee5995d6407ad7c928873' 
  AND token = 'HUhzgJG+qQfpQxTh5+nTlT8v4cneawmM2rDSrlnDlNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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