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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59145921d4d0cd2d3a5ae7ae0434fc898d01566ea7fbe15feb0cfc28cfc9f76d' 
  AND token = 'vaj9IQctvO590p5R+i4XbuPYjtWLP19/sFcubBQAVSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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