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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6987a37b504ddbd96c0611eec7b608e11f8c4d00d9e5378be580fbff7a34eafe' 
  AND token = 'R9RJwMUJLjTOiHK3J/C1B32+dpDbePFdXYDGQFBoMa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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