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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60da44b6e8e73baff4752386c136bc28daa1a64300985be8f3a3265f745badc6' 
  AND token = '6F/3ruQBc9+QJU1FL29jvDgX8o5EWIDnPfQgVvAidvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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