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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51990b39a3ee989f4ae7e5753690879b1f3739f86f97892c44ff3c7fdef4b845' 
  AND token = 'ERZFB0z2X2lWqF4oFG5TQFY3W02qazpnUBWjH6okfVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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