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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c12df18813e4351623b8b418021c4f856c70332ad4f331ceaf21b1b6c36731' 
  AND token = '/vUeB+P2MDBZ3WREFjWN2l9QCjzlMx4WXn4WjtqLrQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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