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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5edddc8f3cadc019f3dafaa8f02a7da7933224d18cf0dea79e85d4ed9af41c1f' 
  AND token = 'LD5MRn4jq/l0QEQ9VV6EdEG4gpp4oWOOtIMYU4fKWKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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