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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05eb94d753d06951e6dd8b48e65df109be184d785d97e491497e238baa86e955' 
  AND token = 'Fx0ujxhJaTr/AmyJNndNEEXxo+iBxw2p0A5xdTJMB4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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