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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18bde70da4ae83bbbe12eb7849bbf4e69bb3c0087fb80061925e5aee55828c6a' 
  AND token = 'Buc7HNR+7CBDVFAjqS2G6oTFlKM0Lyk6NeYR8Yn2k84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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