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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b004da4480914aa2f7a1d5287e2f43a9fecec9fb2822a6c5dc0d4da33bf9f089' 
  AND token = 'tdJwVRMKv4lI7Bvwr2pB0G7D/205IeLQq+GaeqAMYIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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