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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f76b0feec7d2c632e8dd072df685128da0ddc599518133b680a4e22f6ef9e9b' 
  AND token = 'Ffz2wkdWgRsFnY6xlakQdXN0uZ1CwoVAJatrGDjRtjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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