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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9ecbd43e2fcf7b362df8a12293c763e770599f1d86160cf856190e901b5d31' 
  AND token = 'k/Jy8Q31H10eZtqCbFSSXSPGBaDn535jEvozI0wact8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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