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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db295214fde8c87f63e6fbd14e2d7c9881ba769625a2e1eb5158ca0ded667303' 
  AND token = 'SV94YyHzonlT5qDge9i82s5Ab85vLCO1ZM0VwP481D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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