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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12ceacb4a3385cb6c209d05cd555b1e541c3f518cbeb699af7eeba14b022150' 
  AND token = 't3KfBQOhaHgSw9G1QahRliTrJMnLQoGHBSIV+oC3PFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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