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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54fd18db643cd0a0f40be03e497d20dd4d16f2026c5df15fa4b33c15ec0d2dae' 
  AND token = 'qHL4HWWmfmQ9Ha2hJeIzFRFwjl8t2g6e1JUpNFuRoXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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