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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72fe4a01096ce6b3a9c264586537f504fe708f7af8dda7a1c4a78882756ebf2d' 
  AND token = 'hHxCPhDRoztJS445n4e6k3wIADqQWHAaX8BVaojUQk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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