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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e5cc0cdfa7641d63778bf58e5d1cd7b2d72867e8aca4019e136b1636fa5613' 
  AND token = '/7n9gxBTaqnb65B7mJ13uDHIHEukciocely1iMoJ53g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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