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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e8461982f5b33be12300e7b84cc8d3902c07cb26a15c1f643feb0580b3b071' 
  AND token = 'CY0Dr4/eN6PfXrKJf76b6Kx3e1tdimK5rarYQNN/Rjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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