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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bceddd0638d27916237591d3c52ead0eddf637eeb81fb2fa5036e9e37a4653e0' 
  AND token = 'JjEUPjZcev12LHo+/bMkvSAh13ARhD4yEQAnuvHEl9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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