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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef372895789efd9f9a61c8122f98f976277c4bb41da824404a2afdefed5f3b9' 
  AND token = 'cP9xT2pEkul7SPvLMV3KPfToX/X8ZgHEe6f2vxXOiDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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