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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e50128d3b42a73c38c8ee479862d5a47e7d23eba78b07f63d4880d6a4f56f84' 
  AND token = 'gDajqeBMW/SYQYDtEP8PFZVKJ82uj9SMFjkdLg5zr3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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