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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a700c9ecb3fed58860a08ae0534d01cafb5f3673ee630f544082f14355419777' 
  AND token = 'Zm1zijNnsngnsGcmzIK1SutZqOl/0LaOftMRllIzccc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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