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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45471e26f2dc4bbf318e3a0751757d8381200b3716b857ceb1aa2a8c516760d1' 
  AND token = 'qZnoS2yQ32ZnfWh0M93sjIb5HN7x8+yvHoAEm2W6rT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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