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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3676200571ef3dc66e3babeab8b193e3553f2d52f24e31e88c7c311d1863d46b' 
  AND token = 'Ms8u0l85A4nfGof5gUVrX3A2gHRUAwW4qubfQF+z9hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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