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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c21905ddab6f6b78d7773e3eff74950a8e5f5bf65bc4c5d7e526d3ff3b36784' 
  AND token = 'Fb4P7MeMaVfcDXvXxswb7euhBZM3Iqz4hpX+5DsDJoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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