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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b357e1fe8920188df8c9133e1c7ca026cd533b8790d396b932f8317feafdd87' 
  AND token = 'Ylr94IpA14f6C4WgWN7ogf9ddxVD6coq34fSZvm1NdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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