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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a618f8e0f2475b6fd07a811519db33a2420bd7f725b234f33f0e890355dfd1' 
  AND token = '0sHCmO5cHBF73WTIIKR3o05DZzWDpn2o7wEPcDQHziE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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