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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c95a962cbc003de5a6fb3d195dc974c14048a26a3c5595eae89b0d001da212' 
  AND token = 'ZLYo0ebrVaVWs7aHAVvS7R7lqP6zlXFStezYXHC09CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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