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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca55bfe9ae2062bf9681028f59bead0e4d2d16568a34668277ff5253c1264d51' 
  AND token = '876j1ktSnpFjJldtD722V5ZtRWa6LV9R3cswP3RHUFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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