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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8bfa13c85002e97c63dbe26efa560dde2420199a6fd52c31e71d87c0f4bec65' 
  AND token = 'Cpv64MHgZ8Vy+e+zyLo/Xe0s8eFX2z44TzXc0tXvEk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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