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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee4cf46304fff854a7eb7f40c258ee5388b369dcc1e65d5c6359438b332d238' 
  AND token = 'OFJjvMHOs4pWP6KtkjgQir/Hy505C8zl3hzSxEVTU6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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